When one mentions the Hollow Earth theory, many main-stream folks will instantly balk at such a thing and ignore everything beyond. That's rather unfortunate. That said, the Earth is hollow. In fact, every single "rocky" world is indeed hollow.
How do you know?
Easy, it's essentially basic physics, though I do know for certain it is hollow.
Have you ever been to a park with a playground? Sure you have. Have you ever jumped on the merry-go-round and have a friend spin it so hard it becomes difficult to hold on and stay on unless you're sitting in the center? That's because of Centrifugal Force.
Ever since the early days of the Shuttle Program, NASA has been conducting experiments in space, testing theories regarding centrifugal force. They (the various scientists) would set an object in motion, such as a ball of clay or other such material. The purpose was to determine what would happen to these materials in a vacuum and or in a weightless environment. What they uncovered shouldn't really "blow you away" as much as you should essentially feel like a dumb ass for not realizing this earlier:
- No matter the material, it would always become hollow as centrifugal force "pushed" the material from the center toward the exterior. This can of course be applied to each and every single rocky world out there.
Go ahead, try to debate this, just know that no matter what, centrifugal force will be applied to objects in space, thus making them hollow. That's just the way it is.